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Temporal variation in the genetic diversity of a marine invertebrate with long larval phase, the muricid gastropod Concholepas concholepas
Journal of Experimental Marine Biology and Ecology ( IF 2 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jembe.2020.151432
Julian F. Quintero-Galvis , Paulina Bruning , Rocío Paleo-López , Daniela Gomez , Roland Sánchez , Leyla Cárdenas

Abstract Larval dispersal affects population dynamics and thus the evolution of species; therefore, understanding how far planktonic larvae can move is key for the conservation and management of marine species. The degree to which genetic connectivity is temporally stable in marine environments is still largely unknown. Here we evaluated the temporal stability of the spatial genetic structure of the marine gastropod Concholepas concholepas, locally called the loco. This species has a wide geographic distribution along the southeastern Pacific, from Peru to southern Chile. The pelagic larval duration (PLD) of C. concholepas is three months. By comparing samples from eight spatially isolated sites in two different years (2006 and 2011), we analyzed the temporal and spatial variation of genetic diversity using 15 microsatellite loci. The results showed high levels of genetic diversity and high genetic differentiation between and within sample sites in both years. Our results suggest that there is temporal variation in gene flow direction probably drive it by oceanographic currents in the area and consequently larval dispersal at shorter distances might be expected. The Ne estimation suggests a complex demographic history and that inter-annual variability could affect the genetic structure in C. concholepas. This study highlights the importance of integrating temporal scales in the genetic studies of marine species.

中文翻译:

具有长幼虫期的海洋无脊椎动物的遗传多样性的时间变化,鼠科腹足动物 Concholepas concholepas

摘要 幼虫的扩散影响种群动态,从而影响物种的进化;因此,了解浮游幼虫可以移动多远是保护和管理海洋物种的关键。在海洋环境中遗传连通性在时间上的稳定程度在很大程度上仍然未知。在这里,我们评估了海洋腹足动物 Concholepas concholepas(当地称为 loco)的空间遗传结构的时间稳定性。该物种在太平洋东南部有广泛的地理分布,从秘鲁到智利南部。C. concholepas 的远洋幼虫持续时间 (PLD) 是三个月。通过比较两个不同年份(2006 年和 2011 年)来自八个空间孤立站点的样本,我们使用 15 个微卫星位点分析了遗传多样性的时空变异。结果表明,这两年样本点之间和样本点内的遗传多样性和遗传分化水平都很高。我们的结果表明,基因流动方向的时间变化可能是由该地区的海洋洋流驱动的,因此可以预期幼虫会在更短的距离内扩散。Ne 估计表明复杂的人口历史和年际变化可能影响 C. concholepas 的遗传结构。这项研究强调了在海洋物种遗传研究中整合时间尺度的重要性。我们的结果表明,基因流动方向的时间变化可能是由该地区的海洋洋流驱动的,因此可以预期幼虫会在更短的距离内扩散。Ne 估计表明复杂的人口历史和年际变化可能影响 C. concholepas 的遗传结构。这项研究强调了在海洋物种遗传研究中整合时间尺度的重要性。我们的结果表明,基因流动方向的时间变化可能是由该地区的海洋洋流驱动的,因此可以预期幼虫会在更短的距离内扩散。Ne 估计表明复杂的人口历史和年际变化可能影响 C. concholepas 的遗传结构。这项研究强调了在海洋物种遗传研究中整合时间尺度的重要性。
更新日期:2020-09-01
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